Mathematics (AS & A Level) · May / June 2016 · Paper 71 · Question 4
9709
As printed in the paper
The question as text
In the past, the time spent by customers in a certain shop had mean 12.5 minutes and standard deviation 4.2 minutes. Following a change of layout in the shop, the mean time spent in the shop by a random sample of 50 customers is found to be 13.5 minutes.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
4(i)[5]
4(ii)[1]
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